After placing a sponge to remove water, the sloped part of the flowing water around the sponge turns invisible. This is without any sort of resource pack.
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Duplicate of MC-56917 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.

Relinking to MC-57016, as there appears to be an issue specifically with the top of flowing water, and the entire chunk section hasn't turned invisible.